quasar | f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0

General

Target

Client-built.exe
Size

3.1MB
MD5

2e3c730553c130f030cec92a781f2633
SHA1

ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4
SHA256

f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0
SHA512

c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327
SSDEEP

49152:Cv6Y52fyaSZOrPWluWBuGG5g5hJZRJ69bR3LoGdW4THHB72eh2NT:CvP52fyaSZOrPWluWBDG5g5hJZRJ6P

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

999:999

Mutex

5a13e01b-5094-4ae8-9e4e-7b96132114ba

Attributes

encryption_key
C98F5FD72C77D3C38A5C7ECBED91435EDD8177FE
install_name
Client.exe
log_directory
key
reconnect_delay
3000
startup_key
cloud
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/1804-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
behavioral1/files/0x0031000000016de8-5.dat	family_quasar
behavioral1/memory/2732-8-0x0000000000050000-0x0000000000374000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2732	Client.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2816	schtasks.exe
2096	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1804	Client-built.exe
Token: SeDebugPrivilege	2732	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2732	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 2816	1804	Client-built.exe	31
PID 1804 wrote to memory of 2816	1804	Client-built.exe	31
PID 1804 wrote to memory of 2816	1804	Client-built.exe	31
PID 1804 wrote to memory of 2732	1804	Client-built.exe	33
PID 1804 wrote to memory of 2732	1804	Client-built.exe	33
PID 1804 wrote to memory of 2732	1804	Client-built.exe	33
PID 2732 wrote to memory of 2096	2732	Client.exe	34
PID 2732 wrote to memory of 2096	2732	Client.exe	34
PID 2732 wrote to memory of 2096	2732	Client.exe	34

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1804
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2816
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2732
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
2e3c730553c130f030cec92a781f2633

SHA1
ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4

SHA256
f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0

SHA512
c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327

Download Submit
memory/1804-0-0x000007FEF5B73000-0x000007FEF5B74000-memory.dmp

Filesize
4KB

Download
memory/1804-1-0x0000000000D70000-0x0000000001094000-memory.dmp

Filesize
3.1MB

Download
memory/1804-2-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/1804-7-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2732-8-0x0000000000050000-0x0000000000374000-memory.dmp

Filesize
3.1MB

Download
memory/2732-9-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2732-10-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download
memory/2732-11-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads